多层圆筒屏蔽特性计算中的矩阵法

采用矩阵方法分析多层圆筒屏蔽体对内部场的屏蔽特性。对位于屏蔽空间中心的激励沿径向传播的电磁波进行了研究。考虑了多层圆筒屏蔽体的直径、各个屏蔽材料层的媒质参数以及屏蔽层的厚度。分析了在屏蔽空间内到达多层圆筒屏蔽体的电磁波以及穿过多层圆筒屏蔽体的电磁波。利用麦克斯韦方程在各个圆筒屏蔽层的分界处的边界条件，建立相应的矩阵方程。利用矩阵之间的关系，给出了任意多层圆筒屏蔽体的反射系数、屏蔽系统及屏效的完整形

Matrix analysis method for calculating the shielding characteristics of multi-layer cylinder shield

The shielding characteristics of a multi layer cylinder shield against internal field are analyzed. The excitation source was located in the center of the multi layer cylinder shield space, and the electromagnetic wave propagates along the radial of the multi-layer cylinder shield. The diameter of multi layer cylinder shield, medium parameters and thickness of the various shield material layers had been considered in detail. The electromagnetic wave reached the multi layer cylinder shield and the electromagnetic wave penetrated the multi layer cylinder shield in the shield space had ben analyzed. Using boundary conditions in the interface of the various cylinder shield layers, the matrix equations of the boundary conditions are expressed correspondingly. Based on the relations among the matrixes, the analytical solutions for reflection coefficient, shielding coefficient and shielding effectiveness in close form are presented.